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600 Overkill Build

Discussion in 'Rifle Country' started by 56hawk, Jul 29, 2011.


Best looking barrel length for a 600 Overkill

Poll closed Aug 28, 2011.
  1. 16

    10 vote(s)
  2. 18

    18 vote(s)
  3. 20

    41 vote(s)
  1. 56hawk

    56hawk Well-Known Member

    Convinced my gunsmith to build me a 600 Overkill. Building this gun strictly to get the maximum amount of recoil. I have a 460 Weatherby that I use as a range time fun gun, but it's just not impressive enough. See video links:


    Anyway, I have a CZ550 magnum action on order. Just want some opinions on the rest of the parts. The main questions are stock and barrel length. I'm leaning toward a McMillan synthetic stock in light brown/light tan. Open to other color ideas though. Barrel length I want to keep fairly short. I Photoshopped the pictures below to get an idea of what the rifle would look like with 16, 18 and 20 inch barrels. Any thoughts on what looks the best, or any other ideas?

    Attached Files:

  2. Art Eatman

    Art Eatman Administrator Staff Member

    My personal sense of aesthetics is that longer barrels look more well-proportioned.
  3. Sam1911

    Sam1911 Moderator

    Just curious, and I can't seem to find the definative answer:

    Has the .600 Overkill been granted an exemption from the NFA Title II Large Bore Destructive Device classification?

    I know JDJones was able to get several of his >.50" bore wildcats exempted, but I can't find out for sure about the .600 O.
  4. 56hawk

    56hawk Well-Known Member

    No idea on the NFA. It's basically just a belted version of the 600 Nitro Express. Not that it means anything legally, but considering how many companies are selling complete rifles in 600 Overkill I'm not too worried.

    Art - Do you think the barrel should be longer than 20 inches? Figured that was the maximum I wanted for weight reasons. The 16 does kind of make it look like a blunderbuss though.
  5. DM~

    DM~ Well-Known Member

    Someone already built a TC Contender pistol in 600NE, seems if you like recoil, that's what you should build.

  6. HarcyPervin

    HarcyPervin Well-Known Member

    slightly masochistic, but looks like a blast. keep us updated. FWIW, I voted 20, I think it'll look better, just my .02
  7. MachIVshooter

    MachIVshooter Well-Known Member

    Why not a .729 Jongmans or a Nitro 4-Bore?

    Someone made a 13 lb .50 BMG at one point, too.
  8. 1KPerDay

    1KPerDay Well-Known Member

    If recoil is what you really want, go with the shortest barrel. And drill a bunch of holes in the stock. :)

    I voted 20" for aesthetics. A 22" would look even better IMO.
  9. 56hawk

    56hawk Well-Known Member

    MachIVshooter - Cost and weight to answer your question.

    The 600 Overkill is the largest that will fit in a standard magnum action. Also moving up to a 50 BMG action adds a lot of weight. Trying to get in around 8 to 9 lbs.
  10. fireman 9731

    fireman 9731 Well-Known Member

    A shorter barrel will certainly be a bigger boom.
  11. M91/30

    M91/30 Well-Known Member

    What do you against grapes man?!?!
  12. dubbleA

    dubbleA Well-Known Member

    Hawk, you want impressive results on soda and grapefruits at 10-15 yards you need to try a .17, .20, .22 varmint cartridge pushing 4000fps+ with light bullet. If you are really wanting lots of recoil build a 10-15lb 50 BMG without any muzzlebreak and you'll get your wish.
  13. 56hawk

    56hawk Well-Known Member

    M91/30, it's just what we brought to the range that day. lol

    dubbleA, I already have a 243 that pushes a 55 grain bullet over 4000 fps. It is pretty impressive on soda bottles I must admit.

    The 460 Weatherby is also great for breaking rocks though:

    As far as 50 BMGs go, I just don't think I could build one to do what I want. The hard part would be to build one that still looks like a normal bolt action at that weight. Just don't like the looks of most of the single shots or ar lower based 50s. Plus 50s are just to common these days.

    Just some specs:

    600 Overkill
    900 grain bullet
    2300 fps
    8 lb rifle
    300 ft-lb of recoil energy

    50 BMG
    750 grain bullet
    2900 fps
    10.5 lb rifle
    300 ft-lb of recoil energy
  14. Art Eatman

    Art Eatman Administrator Staff Member

    Given how subjective the liking for looks is, I suggest going to a gunshop and just look at the barrel lengths of rifles on the rack to see what looks best to you.

    A lot of it has to do with proportion. A slender stock with a forearm that's not too long can look righteous with a shorter barrel, I imagine.
  15. DAP90

    DAP90 Well-Known Member


    I like the looks of the 20" barrel best.
  16. MachIVshooter

    MachIVshooter Well-Known Member

    I understand the recoil junky thing, but you do realize that 300 ft lb is in excess of what the human body can handle, right? You're gonna end up with a damaged shoulder and/or detached retinas.

    My 7.5 lb .375 Ultra comes back with 82 ft/lbs at 23 MPH with my 300 gr. handloads, and it is enough to give me a headache if I shoot more than a box in one sitting. I've shot stuff that recoiled a little harder, close to 100 ft/lbs. That's about as much abuse as I'll voluntarily subject myself to.

    We only get one body. I'd suggest not doing things that destroy it if you don't absolutely have to.
  17. 56hawk

    56hawk Well-Known Member

    As far as recoil goes my Weatherby comes in at 115 ft-lbs. And while I don't think I've shot much more than ten rounds at one time, it's really no big deal. At least standing up. Did three in a row off the bench, and that kind of sucked. I really want to see what my threshold for recoil is. Planning on loading light to begin with and working my way up. Starting loads should be around 200 ft-lbs.

    Also it's not like I'm the first to build an 8 lb 600 Overkill. Found this video on youtube:
  18. MachIVshooter

    MachIVshooter Well-Known Member

    It's your body, brother, do as you please. Just understand that retina detachment is a very real risk and a very serious injury that can leave you vision impaired or even completely blind. Do some research.
  19. Hizzie

    Hizzie Well-Known Member

    You convinced you gunsmith to build you a 600overkill? Big boree rifles are best left to the experts who build that type of rifle regularly. If your guys doesn't build big bore rifles already this might not be within his skill set. You might want to head over to Accurate Reloading for more big bore info.
  20. Maple_City_Woodsman

    Maple_City_Woodsman Well-Known Member

    OP, you say your a 'recoil junkie' ... Junkies O.D because they crave their high over their physical safety. At 300lbs of recoil you will 'OD' if you go through with this project. Your "fun" will come at the expense of permanently damaged joints and vision loss.

    If you like pain THAT much, just pay a lady in leather to whip you like everyone else.
    Last edited: Jul 30, 2011

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